1. Hardware and Software Conflicts Sometimes, conflicts between hardware components or software applications can lead to Microsoft Outlook crashing or freezing. Ensure that your computer meets the minimum system requirements to run Outlook smoothly. 2 Corrupted Outlook Data Files Corruption in Outlook data files, such as PST (Personal Storage Table) and OST (Offline Storage Table), can cause Outlook to stop responding. These files may get corrupted due to sudden shutdowns, disk errors, or malware infections. 3 Add-in Interference Third-party add-ins can enhance Outlook’s functionality, but incompatible or faulty add-ins can lead to crashes. Identifying and managing add-ins is crucial for a stable Outlook experience. 4 Outdated Outlook Version Using an outdated version of Outlook may result in compatibility issues and unexpected errors. Keeping your Outlook up to date helps prevent such problems.